i don't have a lot of illamasqua's, but the ones i have are amazing. and facet, from the sacred hour collection for autumn 2013, may be my star.
facet is a perfect taupe, leaning more towards brown in sunlight and
grey in the shade. it's real beauty lies in the amazing maching with the
dense coppery and golden fleckish type of shimmer. i would say its
really unique.
one down side, although the formula and application are good, is the
opacity. it is on the sheer side, and it takes either two really thick
or three thin coats for perfect coverage.
natural light:
i used base (china glaze strong adhesion) + three layers of polish + top coat (essence BTGNTS)